Edwin m



(No Model.)

B. M. OARHART.

, ORE ORUSHING MACHINE.

No. 332,488. Patented Dec. 15, 1885.

L E L FIE- l.-

paw/ I N PETERS Fhntn-Lilhogmphcn Washington, D. C.

UNITED STATES PATENT O'Brien.

EDWIN M. OARHART, OF PROVIDENCE, RHODE ISLAND.

ORE-CRUSHING MACHINE.

SPECIFICATION forming part of Letters Patent No. 332,488, dated December15, 1885,

Application filed January 10, 1885. Serial No. 152,465. (No model.)

To all whom it may concern Be it known that I, EDWIN M. CARHART, acitizen of the United States, residing at Providence, in the county ofProvidence and State of Rhode Island, have invented certain new anduseful Improvements in Ore-Crushing Machines; and I do hereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to letters or figures of reference markedthereon, which form a part of this specification.

This my present invention relates to orecrushing machines; and itconsists in certain essential features which combined produce new anduseful results, all as will be more fully hereinafter described andclaimed.

The object of my improvement is to increase the crushing-surfaces of therolls and the circular track, the same being effected by means of aseries of ogee-like concentric corrugations formed upon the conicalfaces of said rolls, the latter revolving upon and around the inclinedtrack provided with concentric corrugations forming the counterpart-ofthe rolls.

In the accompanying sheet of drawings, Figure 1 represents in partialvertical central section-an ore-crushingmill embodying my invention.Fig. 2 is a top view of the same, and Fig. 3 is a partial side view ofthe driving-gear,showing the method of mounting the outer ends oftheroll-shafts.

The following is a description of the invention and its manner ofoperation.

A, again referring to the drawings, designates the bed, having acircular form, its top or crushing surface approximating the form of aflattened conic frustum, and provided with the series of concentricogee-shaped corrugations b, which form the circular path or track uponand around which the crushingrolls B revolve.

a is an outer flange projecting upward from the bed for the purpose offorming the circula-r cavity or trough within which the material isretained during the crushing operation.

f designates a conductor which connects with an opening formed in thelowest portion of said trough for the purpose of drawing off theamalgam, or for other necessary operations as common. One or more ofsaid conductors, each provided with a suitable gate or valve, may beused, if desired. The flange a is also provided with one or morescreen-- covered openings, 10, which permit of the escape and collectionof the fine overflowing material, also as usual.

B is the crushing-rollthe drawings showing a series of four'having aconical form. Its peripheral surface is provided with the series ofconcentric grooves or ogee-shaped corrugations b,adapted to conform tothe basegrooves 1), before described. The outer end, I), of said roll ismade convex, the center of its describing radius being at theintersection of the axes of the horizontal and vertical shafts. By meansof this convexity and the corresponding concave inner surface of theflange a, I am enabled to reduce the friction between said surfaces. Theroll B is provided with an internal chamber, I), Fig. 1, for the purposeof reducing its weight, thereby adapting it to be more readily handledand transported over rough and mountainous roads. Said chamber, however,may be subsequently filled with plaster, or other suitable material, ifdesired, to increase the weight of the roll.

D designates the main driving or carrying wheel, provided with cogs Dupon its outer edge, said gear-wheel being firmly secured to the uprightshaft E.

a n represent a series of downwardly-pro jecting guides, adapted toreceive bearings K, which in turn support the outer ends of the shafts0. These bearings are arranged to slide freely in a vertical direction,but are retained laterally by means of the lips or flanges a, Fig. 3.

The lower end of the gear-hub is adapted to receive and retain the innerspherical ends, 0, of the roll-shafts, thus forming a pivot by means ofthe ball-and-socket joint. A removable flange, D, being a continuationof said hub, is provided with cupshaped depressions corresponding tothose formed in the upper part of the hub. By means of said joints theroll-shafts are secured in position both longitudinally and laterally,but are adapted to vibrate in a vertical direction, all as fully shown.

electric circuit.

The roll-shafts, as before stated, are mounted l cles will graduallyaccumulate at the lowest in the gear D, the inner ends, 0, beingretained in the hub of the gear, while the outer ends are supported inthe bearings K, mounted upon the under side of the gear-rim, ashereinbefore described. The corrugated crushing-rolls are secured tosaid shafts intermediate of the gear-hub and its rim, and alternatingwith the spokes or arms (I. The upright shaft E rests in a step, 8, atthe center of the base A, the upper end of said shaft being journaled ina box, J, secured to the frame or beam H, as usual.

F designates a small bevel-gear secured to the jack-shaft G, the latterbeing mounted in bearings h. A pulley, t, secured to this shaft, isadapted to receive transmitted power by means of the belt t", also ascommon. The gear F meshes into and drives the large overhanging gear, D,as shown. By means of this arrangement I am enabled to reduce thetorsional pressure upon the upright shaft, as well as to operate themachine with less power, or alighter class of motors for a given output,as compared with other mills employing this system of reducing ores.

Z indicates a tube adapted to conduct water into the perforated circularpipe m, the water falling therefrom to the circular track I)" for thepurpose of mingling with the quartz and ores to assist in allaying thedust, as well as to assist in disintegrating the material under thecrushers.

Z designates a conducting-wire leading from the dynamo or other electricsource, adapted to "electrically connect the crushing mechanism, and Zis the return-wire leading therefrom to the dynamo, thus completing theThe step 8 may be lined with insulating or non-conducting material, ifdesired.

The several parts having been assembled and arranged to form thecomplete machine, substantially as shown in the drawings, its operationwould be as follows: The material orore is first delivered into thetrough of the bed, within which also has been placed a quantity ofmercury, when, upon revolving the gear D, the rollers B commence toperform the work of crushing the ores lying upon the circular path, thecorrugations b of said path serving not only to increase the area of itscrushing-surface, but also serving as a series of riffles or slightbarriers to prevent, in a greater degree than heretofore, the mass ofthe ore from falling or sliding into the lower portion of the troughuntil sufficiently pulverized by the combined action of the water androlls.

The bearings K readily permit the rolls to pass over the irregularpieces of ore, &c., the gear Dat the same time remaining practicallyinvariaole in its vertical direction. As the crushing operationprogresses, the finer partiportion of the track, the larger ends of therolls corresponding therewith, owing to their greater peripheralvelocities and weight, also assisting in producing this result. Asbefore stated, the screen-covered openings to permit the float toescape, the same being collected and concentrated as usual. After theores have been sufficiently reduced, the amalgam is withdrawn and thentreated by any suitable mercurial process as commonly employed in thismethod of crushing.

I contemplate, when convenient or desirable, to drive'the gear D bymeans of an additional pinion, F, located upon the opposite side of themachine, thereby balancing the pressure upon the gear and its shaft.

Having thus described my invention,what I claim as new, and desire tosecure by Letter Patent of the United States, is-

1. In an ore-crushing machine, a bed having a circular inclined trackprovided with a series of concentric corrugations, forming thecrushingsurface, in combination with crushing-rolls, each secured to asupporting-shaft mounted in bearings, forming a part of thedriving-gear, the surface of each roll being substantially acone-frustum, and provided with a series of concentric grooves orcorrugatlons, forming the counterpart of the circular track of said bed,substantially as shown and described.

2. The ore crushing machine herein described, consisting of thestationary bed A,

having the beveled and corrugated circular crushing-track b, and thevertical circular retaining-flange a, provided with the concave innersurface, the crushing-rolls B, each having a series of concentriccorrugations, b, and the convex shaped outer end, 0 adapted to conformto said track and flange, shafts O, carrying the rolls, the driving-gearD, having said shafts mounted therein, the vertical shaft E,carrying thegear, and means, substantially as shown, for imparting rotary motion tothe gear, as set forth.

3. In an ore-crushing machine, the. conical crushing-rolls B, eachhaving a series of concentric ogee-like corrugations, b, and means,substantially as described, for mounting and driving said rolls, incombination with the stationaryloed A, having an inclined circular trackprovided with a series of concentric corrugations, b, forming thecounterpart of the rolls crushing-surface, as and for the purposespecified.

In testimony whereof I have affixed my signature in presence of twowitnesses.

EDWIN M. GARHART.

